Key Engineering Materials Vol. 621

Abstract: The old town of the city, which has complicated network, is difficult to reform. Because of the traditional flat's low utilization of parking space and shortage of parking spaces, it is urgent to improve the existing public parking facilities for enhancing the status of the old area traffic and promoting the economic development of the old city. On the basis of the thought of double helix bionic structure, this article is to design a new energy-saving convenient parking building. Taking the double helix structure of DNA as the design concept, it takes the advantage of the double spiral of extraction track, and telescopic parking device of intelligent multiple angle, rotating parking platform, interactive extraction of vehicle system and a model for effective utilization of energy to improve the vertical lifting mode of the original stereo parking lot. Taking the characteristics of renewable energy and kinetic energy into consideration, it analyzed the available energy stability and the cost of using index, from the angle of reducing the output operation power and saving the energy. Research results can make the stereo garage's intelligence operation possible, parking access intelligence operations and be able to largely providing ground spaces, and it can greatly provide ground parking capacity, which improves the difficult parking problem in central business district effectively.

Abstract: Aiming to the difficulty of washing-hand for a one-armed man, functional requirements of washing-hand for a one-armed man is analyzed, and TRIZ theory is described in detail. A novel conceptual assisted washing-hand device for a one-armed man is put forward in this paper. Innovative problems of the assisted washing-hand device design were solved based on contradiction conflict matrix theory and material field theory of TRIZ. The whole three-dimensional model of assisted washing-hand device is built. TRIZ theory can provide the reference basis for structural design of assisted washing-hand device for a one-armed man.

Abstract: Automobile engine memory in carbon deposition, will have a serious impact on the engine. This effect is reflected not only in the physical structure of the damage to the engine itself, will make the work efficiency of engine to reduce. Mixed gas carbon removal as a new method of removing the engine carbon deposit, not only without disassembling the engine, the method is simple, but also on the surrounding environment will not cause harm. At present, the method of removing carbon deposition engine mixed gas is widely used in automobile engine maintenance. This article will from the principle of mixed gas removal method of carbon by theoretical analysis and research system. In this paper, the mechanism of removal of carbon hydrogen and oxygen are analyzed and studied. Firstly, discusses the methods of preparation of carbon to hydrogen, through simple calculation of water electrolysis hydrogen production, the quantity and the required relationship between the electric quantity. The chapter on the causes and harms of engine carbon deposit is analyzed, according to the formation and properties of carbon, hydrogen and oxygen and carbon removal principle of osmosis respectively from the macro micro chemical reaction, combustion characteristics and ultrastructure of H2 molecule on carbon, and deduced the H2 and carbon deposition reaction of general chemical formula.

Abstract: Circle film carbon potentiometer, as a kind of position feedback device, is widely used in the servo feedback system in the field of aviation and aerospace technology. In the processes of making circle potentiometer, the process of correction on the linearity is an important factor which affects the pass rate of precise carbon-film potentiometer. Now people usually correct the linearity of potentiometer manually, with a lowefficiency and bad effect. Accordingly, in this work we develop a set of correct system on the linearity correction of circle precise carbon-film potentiometer by some research on the correct crafts of some circle potentiometer. The system mainly consists of circuit test part, mechanical correction part and PC control part. This system realizes the auto-correction of the linearity of circle potentiometer by measuring the resistance before correcting, substituting it to predetermined algorithm to make a target value and correcting the linearity. When using this system in the experiment, the corrected linearity of circle potentiometer is below 0.5%, which meets the develop target and using requirement.

Abstract: In order to make the food safety testing instrument more flexible and convenient and process a lot of data, combining the advantages of the VB interface design and MATLAB secondary development, the serial communication software is developed based food safety testing instrument. The test data is uploaded to computer through RS232 serial port. The research staff needs only to input the parameters simply, and all the parameters were automatically matching with the testing instrument, the test data reception, processing, preservation, search and delete functions was completed through VB calling MATLAB. The software has the abilities of friendly interface, easy to use, high stability, and can shield and correct the misuse of users. It has high value in engineering and can be widely used in similar embedded test instrument.

Abstract: In wireless sensor networks (WSNs), estimation of the location of the unknown node based on the average hop distance is an important research problem for range free localization algorithm. As one of the range free algorithm, DV-Hop chooses the average hop distance comes from the nearest beacon, can't reflect the real status of WSNs. We observe that the unknown node can achieve the precise location when one feedback channels are built between the unknown node and the beacons which embedded accurate location. Based on this observation, we propose one improved DV-Hop localization algorithm based on feedback mechanism (FDV-Hop). Using DV-Hop, the unknown node achieves the estimated location, and broadcasts its average hop distance to the beacons. The beacons also use DV-Hop to calculate their location based on the average hop distance from the unknown node. Then the beacons calculate the difference between the estimated location and the real location, and send the difference between them to unknown node with weights setting. The unknown node recalculates its location which involving the difference of location and the weights. The simulation shows that FDV-Hop can reduce the average localization error effectively and keep the localization stable.

Abstract: The sound source of violin is string vibration. By the stick–slip friction action between bow and string of violin, string and bridge form a complicated vibration system. The interaction mechanism of bowstring is very intricacy. In this paper, through theoretical analysis and experiment, the vibration behavior of violin string is investigated. We measured the vibration images of bowing and plucking violin string on a high-speed photography optical platform and got two different character of string vibration, including vibration displacement, velocity and space trajectory of the mark point on string. By comparing the displacement curves of the different points among on string, the variety of the ratio of positive process time to negative one of vibration sawtooth waveform are studied, and also the formation process of string vibration enveloping curve. On this basis, the Helmholtz motion of string vibration which is presented at 1862 is studied.

Abstract: As the key technologies such as wireless communication, sensor continues to mature, wireless sensor networks has become a domestic and foreign focus of research in the field of wireless networks. The main work of the thesis is to implement ZigBee wireless sensor networking, using open source protocol FreakZ On the base of existing hardware. WSN hardware node consists of 32-bit microprocessor STM32F102CB based on ARM Cortex-M3 kernel and AT86RF212 radio transceiver; the software platform uses a lightweight multi-tasking operating system Contiki and open source protocol stack called FreakZ following ZigBee protocol specification, for networking wireless networks nodes. The paper presents the system architecture of WSN networking and its hardware components, software architecture and data transmission and reception processes of the networks. Using FreakZ protocol stack under the Contiki operating system on the base of the existing hardware platform, the network nodes information and topology displayed on the HyperTerminal indicates the success of WSN networking by using FreakZ protocol.

Abstract: The resource allocation problems of virtual enterprise were analyzed by introducing the content of the virtual enterprise resource management and classifications. From the task decomposition of virtual enterprise, the enterprise business process reengineering (BRP) and enterprise resource planning (ERP) were introduced into the actual operation on resource allocation of virtual enterprise. The framework model, which was based on artificial intelligence body hierarchical Multi-Agent system, was put forward. Finally, through constructing the operation of the management system of virtual enterprise partners, it proved that the resource allocation model which was put forward in this paper could effectively meet customer needs and reduce the enterprise cost.

Abstract: Complex-product manufacturers are encountered with heterogeneous data structure in business information systems (BIS) and disconnection between product data management (PDM) and overall corporate demands. In this paper, we aim to overcome these defects. Targeting at the PDM-related business domains, we proposed the concept of subject-based integration and global management of complex product data. We analyzed the advantages of product data resource models built at corporate level and studied the major methods for planning of complex product subject database. We defined a C-U matrix described by business process class and product data class, and thereby built a framework of complex product data resources corresponding to business process models and data models. Using materials as the basic management object, we also proposed the structure of a complex product subject data system and provided the method for generalized organization of global product data. Based on this, we built a model for complex product subject database and used data adapters to build the mapping between BIS source data and product subject database. We achieved cross-BIS integration and global management of complex product data oriented at big data.